3.3 One sentence in each pair is wrong. Correct it by replacing the past simple with the present perfect of the italicised verb.

1. a

Corrected sentence: Remember that after you have signed the contract you won't be able to change your mind.

1. b

This sentence is correct.

2. a

Corrected sentence: As soon as I have finished college I want to travel around Australia.

2. b

This sentence is correct.

3. a

Corrected sentence: By the time Sarah got to work the meeting had finished. (Note: This requires past perfect, not present perfect, to indicate an action completed before another past action.)

3. b

This sentence is correct.

4. a

This sentence is correct.

4. b

Corrected sentence: I'll tell you what time we're coming the moment I have heard from Emil.